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at right angles, about 10 in 0,oi mm. In the centre of the
valve is a large blank area, where the puncta are absent or
as erased. Length 0,03—0,o5 mm. Breadth 0,012—0,<m mm.
— Pl. 37, fig. 56. •
II. quarnerensis Grun. (Verh. 1862, Pl. IV, fig. 24)? It
is with great hesitation I have determined the form Pl.
37, fig. 53 as the above speeies. There is in the middle of
the area a faint trace of a median line and of a very
indi-stinct central nodule, from which characters the form mav
approach the genus Glyphodesmus. The forme of the valve
is sometimes a little cuneate (a).
R.? margimäata Cl. & Grun. — Lanceolate with marginal
strise, 15 in 0,oi mm., surrounding an apparently structure-less
large area. Length 0,o42 mm. Breadth 0,oo9 mm. — Pl. 37,
fig. 57.
Mr. Grunow found the same speeies in gatherings from
the Seycliells. According to Mr. Grunow the large area is
pervaded by the shallow continuation of the marginal striso
and has in the middle a median line, which I could not see
with my len ses.
Trachysphenia australis H. L. Smith. (Raphoneis australis
H. L. Sm. Am. Quarterl. M. J. 1878, pag. 14, Pl. III, fig. 6.
Tr. australis var.? Aucklandica Grun. in Van Heurck Syn.
Pl. XXXVII, fig. 1). The genus Trachysphenia was
establisli-ed by Mr. Petit in 1877 (Diat. de Campbell pag. 32). The
Tr. australis Petit 1. c. Pl. A", fig 19, is large and has 6 puncta
in 0,oi mm. It seems then to be different from Raphoneis
australis H. L. Smith, which is 0,oi28—0,o2i8 mm. in length and
has 12 puncta in 0,oi mm. The specimens from Labuan are
about 0,022 111111. in length and have 11 rows of puncta 011 0,oi
mm. Similar forms have I seen in gatherings from Port Jackson.
o o
The cuneate form of the valve does not seem to be a constant
characteristic, as I have found elliptic valves, to the sculpture
agreeing with the cuneate ones. Such a specimen, var. elliptica
Cl., has been figured on Pl. 37, fig. 54.
Synedra commutata var. septentrionalis Grun. (Van Heurck
Syn. Pl. XL, fig. 5) Length 0,054 mm. Strise 13 in 0,oi mm.
S. a ffinis Kiitz. — Strise 13 in 0,oi mm., area tolerably narrow.
S. Hennedyana Greg. (Diat. of Clyde pag. 532, Pl. XIV,
fig. 108).
S. crystallina var. Smithii Grun. (Van Heurck Svn. Pl.
XLII, fig. 10).
S. fulgens Grev. (Sm. Syn. 1, pag. 74, Pl. XII, tig. 103).
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